@article{f9ce3fc4e254486d9bbd63c46b2a0160,
title = "In situ resonant photoemission characterization of La0.6Sr 0.4MnO3 layers buried in insulating perovskite oxides",
abstract = "We have investigated the Mn 3d partial density of states in SrTiO3 (STO) La0.6 Sr0.4 MnO3 (LSMO) heterointerfaces as well as of LSMO films using Mn 2p-3d resonant photoemission spectroscopy. The strong enhancement of the Mn 3d spectra at the Mn 2p-3d threshold enables us to extract the Mn 3d spectra of LSMO layers in the vicinity of the interface with the STO overlayers. We have found that the spectral intensity of eg↑ states near the Fermi level is drastically reduced when the LSMO film is capped with STO overlayers. The close similarity in reduction of the intensity of the eg↑ states between the STO/LSMO interface and hole-doped LSMO films suggests that the hole doping into the LSMO layer close to the STO layer originates from the chemical carrier-concentration modulation at the valence-mismatched interface composed of the stacking sequence - TiO2 -SrO- MnO2 - La0.6 Sr0.4 O-, which is inevitable for multilayers based on perovskite oxides.",
author = "H. Kumigashira and R. Hashimoto and A. Chikamatsu and M. Oshima and T. Ohnishi and M. Lippmaa and H. Wadati and A. Fujimori and K. Ono and M. Kawasaki and H. Koinuma",
note = "Funding Information: This work was done under Project No. 02S2-002 at the Institute of Materials Structure Science at KEK. This work was supported by a Grant in Aid for Scientific Research (A16 204 024 and S17 101 004) from the Japan Society for the Promotion of Science. FIG. 1. (Color online) Typical RHEED oscillation during the growth of STO (5 ML)/ LSMO (50 ML) multilayers grown on STO substrates. FIG. 2. AFM images (scan area 1 × 1 μ m 2 ) for (a) the LSMO ( x = 0.4 ) film and the STO/LSMO multilayer with a STO overlayer thickness of (b) 1 ML; (c) 2 ML; (d) 3 ML; (e) 5 ML; and (f) 7 ML. FIG. 3. (Color online) Mn 3 d spectra of LSMO layers in the vicinity of an interface with STO. Mn 3 d spectra of LSMO ( x = 0.4 and 0.55) films are also presented for a comparison. The inset shows Mn 2 p - 3 d resonant photoemission spectra of STO/LSMO multilayers with a STO layer thickness of 3 ML measured with h ν = 644 eV (on resonance) and 636 eV (off resonance), together with the difference curve obtained by subtracting the off-resonance spectra from the on-resonance spectra. ",
year = "2006",
doi = "10.1063/1.2163827",
language = "English",
volume = "99",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics Publising LLC",
number = "8",
}